This question already has answers here:
Java string to date conversion
(17 answers)
Closed 5 years ago.
I try to use java.util.Date date = Date.from( Instant.parse(minDates)); to parse the date string given in format Wed Jan 17 2001 00:00:00 GMT 0530.
I am not able to figure out, how to do that in JAVA.
The want to convert the given date string in given format
2013-05-22T00:00:00
May be i am not able to figure it out, properly. If someone have way to do that suggest me in Java Only.
Here is the solution:
String dateToParse = "Wed Jan 17 2001 00:00:00 GMT 0530";
SimpleDateFormat in = new SimpleDateFormat("EEE MMM dd YYYY HH:mm:ss");
SimpleDateFormat out = new SimpleDateFormat("YYYY-MM-dd'T'HH:mm:ss");
Date date = in.parse( dateToParse );
System.out.println( out.format( date ) );
It will work if all dates are in the same timezone (GMT 0530)
Else it should be modified to support it, but I suppose you have the same timezone.
You can do that by using SimpleDateFormat 'parse' API.
You can initialize your SimpleDateFormat with any valid time format such as yyyy-MM-dd HH:mm:ss z and then parse any string which adheres to this format.
reff. to http://docs.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html
One addition tip, use JodaTime as the Date and SDF in Java are getting deprecated: http://www.joda.org/joda-time/
If you are using Java 8+, You can use java.time.OffsetDateTime (or Instant...) instead of java.util.Date, which is incredibly easy.
OffsetDateTime odt = OffsetDateTime .parse("2013-05-22T00:00:00", DateTimeFormatter.ISO_LOCAL_DATE_TIME);
Note that the second argument is optional in this case but you could have to specify one (with timezone id for example).
There is a solution without external which works with older version of Java and that manages timezones well. It consists of using JAXB's DataTypeConverter.
Date date = javax.xml.bind.DatatypeConverter.parseDateTime("2013-05-22T00:00:00+01:00").getTime();
Note that DatatypeConverter.parseDateTime returns a Calendar. You just need to call its getTime() method to convert is to a Date.
Related
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How to properly format the date?
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Get Date type object in format in java
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display Java.util.Date in a specific format
(11 answers)
Closed 1 year ago.
The community reviewed whether to reopen this question 1 year ago and left it closed:
Original close reason(s) were not resolved
I have looked around for help on this, but again, it's just one of those things that I cannot find a suitable answer to my specific issue.
Here's 2 very detailed (and helpful) SO posts that I've looked at:
Change date format in a Java string
Java string to date conversion
This is what I have:
//Date Formatter
SimpleDateFormat dateFormatter1 = new SimpleDateFormat("yyyy-MM-dd", new Locale("EN"));
SimpleDateFormat dateFormatter2 = new SimpleDateFormat("dd MMMM yyyy", new Locale("EN"));
//Convert to Date
Date dateToParse = dateFormatter1.parse("2024-01-01");
//Format OUTPUT date
String dateAsString = dateFormatter1.format(dateToParse);
System.out.println(dateAsString); //01 January 2024
//Convert OUTPUT date from STRING to DATE
Date dateToReturn = dateFormatter1.parse(dateAsString);
System.out.println(dateToReturn.toString()); //Mon Jan 01 00:00:00 SAST 2024
Note:
I used both DateFormatter and SimpleDateFormatter but got the same output.
The outputs are very different and what I am trying to achieve is to have my String created as a Date object in the exact same format.
I feel I am missing something but I just cannot figure out what.
The code I provided is a snippet from a bigger function that returns type Date
The function wasn't created by myself, I'm picking up from where someone else left off
Whenever you call a .toString() method on a Date, then the DateFormatter is not taken into account. The format of date you get is just a matter of default toString implementation of Date class.
To use formatter while printing, try something like this (instead of the last line in your snippet):
System.out.println(dateFormatter1.format(dateToReturn));
Date.toString() returns always returns a string in the format dow mon dd hh:mm:ss zzz yyyy.
You'll need to reuse the formatter's format method to get the initial string you expect
This question already has answers here:
ParseException when parsing 3 character abbreviated month using SimpleDateFormat
(5 answers)
Closed 4 years ago.
i have a SimpleDateFormat format = new SimpleDateFormat("d M y H:m"); and i try to parse the String "8 Jan 2019 16:47" with it, but i get a ParseException. Did i create it the wrong way?
According to docs.oracle.com the M should recognize 3-letter-months.
Can anyone help me?
The official documentation: (https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html)
You probably missed out this little note here:
Month: If the number of pattern letters is 3 or more, the month is interpreted as text; otherwise, it is interpreted as a number.
Based on your example input, the following works:
SimpleDateFormat format = new SimpleDateFormat("dd MMM yyyy HH:mm");
java.time
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("d MMM y H:mm", Locale.ENGLISH);
String stringToParse = "8 Jan 2019 16:47";
LocalDateTime dateTime = LocalDateTime.parse(stringToParse, formatter);
System.out.println(dateTime);
The output from this snippet is:
2019-01-08T16:47
What went wrong in your code?
SimpleDateFormat and Date are poorly designed and long outdated, the former in particular notoriously troublesome. I recommend you don’t use them in 2019.
As others have said you need three M for month abbreviation (no matter if you are using the outdated SimpleDateFormat or the modern DateTimeFormatter). One M will match a month number in 1 or 2 digits, for example 1 for January.
You should also specify a locale for your formatter. I took Jan to be English so specified Locale.ENGLISH. If you don’t specify locale, the JVM’s default locale will be used, which may work well on some JVMs and suddenly break some day when the default locale has been changed or you are trying to run your program on a different computer.
Link
Oracle tutorial: Date Time explaining how to use java.time.
I am trying to get my current system date and am formatting it into Etc/UTC and then into this "dd.MM.yyyy HH:mm z" format. The problem is this that the format function after formatting the date returns a string instead of date. Here is the code spinet below
final Date currentDate = new Date();
final SimpleDateFormat dateFormatter = new SimpleDateFormat("dd.MM.yyyy HH:mm z");
dateFormatter.setTimeZone(TimeZone.getTimeZone("Etc/UTC"));
String finalDateTime= dateFormatter.format(currentDate);
System.out.println(finalDateTime);
Is there any alternative solution which allows me to format the date by keeping me within this date object because I have researched every date library after java 8 and before java 8, it seems like if I want to format any type of date or dateTime, I have to use a formatter which converts the given date into string.
Any Alternative solutions or it is not possible?
Date represents a single point in time. That's it, nothing more, nothing less. It does not contain any information about time zones.
Wed Jun 06 12:38:15 BST 2018 is the same Date (instant) as Wed Jun 06 11:38:15 GMT 2018, just in a different time zone. It's like the words "humans" and "homo sapians". They refer to the same species, they are just kind of in a different "format".
So you don't need to change the date in any way. You just need to format it differently. This is why formatters return Strings. Only Strings can represent one particular format of a date.
This question already has answers here:
Unix epoch time to Java Date object
(7 answers)
Closed 5 years ago.
How can I convert minutes from Unix timestamp to date and time in java? For example, timestamp 1372339860 correspond to Thu, 27 Jun 2013 13:31:00 GMT.
I want to convert 1372339860 to 2013-06-27 13:31:00 GMT.
Edit: Actually I want it to be according to US timing GMT-4, so it will be 2013-06-27 09:31:00.
You can use SimlpeDateFormat to format your date like this:
long unixSeconds = 1372339860;
// convert seconds to milliseconds
Date date = new java.util.Date(unixSeconds*1000L);
// the format of your date
SimpleDateFormat sdf = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss z");
// give a timezone reference for formatting (see comment at the bottom)
sdf.setTimeZone(java.util.TimeZone.getTimeZone("GMT-4"));
String formattedDate = sdf.format(date);
System.out.println(formattedDate);
The pattern that SimpleDateFormat takes if very flexible, you can check in the javadocs all the variations you can use to produce different formatting based on the patterns you write given a specific Date. http://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html
Because a Date provides a getTime() method that returns the milliseconds since EPOC, it is required that you give to SimpleDateFormat a timezone to format the date properly acording to your timezone, otherwise it will use the default timezone of the JVM (which if well configured will anyways be right)
Java 8 introduces the Instant.ofEpochSecond utility method for creating an Instant from a Unix timestamp, this can then be converted into a ZonedDateTime and finally formatted, e.g.:
final DateTimeFormatter formatter =
DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
final long unixTime = 1372339860;
final String formattedDtm = Instant.ofEpochSecond(unixTime)
.atZone(ZoneId.of("GMT-4"))
.format(formatter);
System.out.println(formattedDtm); // => '2013-06-27 09:31:00'
I thought this might be useful for people who are using Java 8.
You need to convert it to milliseconds by multiplying the timestamp by 1000:
java.util.Date dateTime=new java.util.Date((long)timeStamp*1000);
This question already has answers here:
Convert GMT to IST in java?
(5 answers)
Closed 6 years ago.
I am trying to convert time zone from UTC to GMT in java. I have tried several times and even used your guided method too. I am getting my output with correct timing in GMT format but along with "PDT 2012" written with it. Why so..?? I have tried hundreds of methods but can't get rid of it.
Please help me.
Thanks
For all Date / or DateTime related operations in Java I would recommend to use JodaTime Library
It is very useful to use Date/time with different point of views (calendar, timezone) and for computation as well: adding/substracting months, years, days and so on...
Since Java 8, an equivalent (improvement) of JodaTime is included in the JDK under the new package java.time (JSR-310) and no more needed to add it as dependency.
The author of JodaTime explains in his blog the difference between JodaTime and JSR-310.
Perhaps the following will be a starting point. It converts your current date to GMT:
SimpleDateFormat dateFormat = new SimpleDateFormat("EEE MMM dd HH:mm:ss z yyyy");
Calendar cal = Calendar.getInstance();
System.out.println(cal.getTime());
TimeZone currentTimeZone = cal.getTimeZone();
int offset = currentTimeZone.getOffset(cal.getTimeInMillis());
Date adjustedTime = new Date(cal.getTimeInMillis() - offset);
dateFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
System.out.println(dateFormat.format(adjustedTime));
A couple of notes:
You are probably not able see the PST change to UTC because you don't set the timezone on the date format
You shouldn't really use the abbreviations like "GMT" anymore. It is better to use the full name in the id field.
You'll have to be a bit more creative if you happen to run the above code on a system that has its default time already set to GMT.